“The production of heat alone is not sufficient to give birth to impelling power: it is necessary that there should also be cold; without it, the heat would be useless.” SciencePhysicsHeatSteamThermodynamicsClassical Mechanics Book:Reflections on the Motive Power of Fire: And Other Papers on the Second Law of Thermodynamics Source: Reflections on the Motive Power of Fire: And Other Papers on the Second Law of Thermodynamics